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Here is the latest sketch I am using. The .txt is for viewing the .ino is to download

arduino04-webserial.txt This arduino sketch can be viewed

arduino04-webserial.ino Click to download: Note: New ArduinoWebSerial testing code. Make sure in Arduino Serial Monitor you don't send a new-line This Github at https://github.com/hpssjellis/web-serial-polyfill

Original Demo from Google Developers codelabs.